When I try to open an in-game model with the model editor in the workshop tools, it crashes completely.

This is what the console shows when it happens

[ W General ]: Attempted to add two serializers with the same file encoding (keyvalues)!
[ W General ]: Attempted to add two serializers with the same file encoding (keyvalues2)!
[ W General ]: Attempted to add two serializers with the same file encoding (keyvalues2_flat)!
[ W General ]: Attempted to add two serializers with the same file encoding (keyvalues2_noids)!
[ W General ]: Attempted to add two serializers with the same file encoding (binary)!
[ W General ]: Attempted to add two serializers with the same file encoding (binary_seqids)!
[ W General ]: Attempted to add two serializers with the same file encoding (actbusy)!
[ W General ]: Attempted to add two serializers with the same file encoding (commentary)!
[ W General ]: Attempted to add two serializers with the same file encoding (vmt)!
[ W General ]: Attempted to add two serializers with the same file encoding (mks)!
[ W General ]: Attempted to add two serializers with the same file encoding (tex_source1)!
[ W General ]: Attempted to add two legacy updaters with the same file format (sfm_v1)!
[ W General ]: Attempted to add two legacy updaters with the same file format (sfm_v2)!
[ W General ]: Attempted to add two legacy updaters with the same file format (sfm_v3)!
[ W General ]: Attempted to add two legacy updaters with the same file format (sfm_v4)!
[ W General ]: Attempted to add two legacy updaters with the same file format (sfm_v5)!
[ W General ]: Attempted to add two legacy updaters with the same file format (sfm_v6)!
[ W General ]: Attempted to add two legacy updaters with the same file format (sfm_v7)!
[ W General ]: Attempted to add two legacy updaters with the same file format (sfm_v8)!
[ W General ]: Attempted to add two legacy updaters with the same file format (sfm_v9)!
[ W General ]: Attempted to add two format updaters with the same file format (dmx)!
[ W General ]: Attempted to add two format updaters with the same file format (movieobjects)!
[ W General ]: Attempted to add two format updaters with the same file format (sfm)!
[ W General ]: Attempted to add two format updaters with the same file format (sfm_settings)!
[ W General ]: Attempted to add two format updaters with the same file format (sfm_session)!
[ W General ]: Attempted to add two format updaters with the same file format (sfm_trackgroup)!
[ W General ]: Attempted to add two format updaters with the same file format (pcf)!
[ W General ]: Attempted to add two format updaters with the same file format (gui)!
[ W General ]: Attempted to add two format updaters with the same file format (schema)!
[ W General ]: Attempted to add two format updaters with the same file format (preset)!
[ W General ]: Attempted to add two format updaters with the same file format (facial_animation)!
[ W General ]: Attempted to add two format updaters with the same file format (model)!
[ W General ]: Attempted to add two format updaters with the same file format (ved)!
[ W General ]: Attempted to add two format updaters with the same file format (vmks)!
[ W General ]: Attempted to add two format updaters with the same file format (mp_preprocess)!
[ W General ]: Attempted to add two format updaters with the same file format (mp_root)!
[ W General ]: Attempted to add two format updaters with the same file format (mp_model)!
[ W General ]: Attempted to add two format updaters with the same file format (mp_anim)!
[ W General ]: Attempted to add two format updaters with the same file format (mp_physics)!
[ W General ]: Attempted to add two format updaters with the same file format (mp_hitbox)!
[ W General ]: Attempted to add two format updaters with the same file format (mp_materialgroup)!
[ W General ]: Attempted to add two format updaters with the same file format (mp_keyvalues)!
[ W General ]: Attempted to add two format updaters with the same file format (mp_eyes)!
[ W General ]: Attempted to add two format updaters with the same file format (mp_bonemask)!
[ W General ]: Attempted to add two format updaters with the same file format (vtex)!
[ W General ]: Attempted to add two format updaters with the same file format (world)!
[ W General ]: Attempted to add two format updaters with the same file format (worldnode)!
[ W General ]: Attempted to add two format updaters with the same file format (virtualvolumetexture)!
[ W General ]: Attempted to add two format updaters with the same file format (vmap)!
[ W General ]: Attempted to add two format updaters with the same file format (vanim)!
[ W General ]: Attempted to add two format updaters with the same file format (animflags)!
[ Developer ]: XboxDVRCheck: AllowGameDVR = 0x00000001 (e0x00000006)
[ Developer ]: XboxDVRCheck: AppCaptureEnabled = 0x00000000 (e0x00000002)
[ Developer ]: XboxDVRCheck: GameDVR_Enabled = 0x00000001 (e0x00000000)
[ ]: Disconnected From 'Localhost:29000'
[ ]: Connecting To 'Localhost:29000'
[ ]: Connected To 'Localhost:29000'

Yea, this has been an issue since the new update. We've contacted Valve several times about this issue and others related to it until they fixed the initial tools launch problem, which might correlate to the model editor crashes we have now.